Monteplase/Nadolol 1345 Moxisylyte is given as the hydrochloride but the dose may be tion half-life is 2 to 3 hours and is prolonged in renal Pharmacopoeias. In Eur. (see p.vii), Jpn, and US. expressed in terms of the base. Moxisylyte hydrochloride impairment. Moxonidine is about 7% bound to plasma Ph. Eur. 6.2 (Nadolol). A white or almost white crystalline 45.2 mg is equivalent to about 40 mg of moxisylyte. proteins. It is distributed into breast milk. powder. Slightly soluble in water; freely soluble in alcohol; prac- In the management of peripheral vascular disease, the usual tically insoluble in acetone. oral dose is the equivalent of 40 mg of moxisylyte four times dai- USP 31 (Nadolol). A white or off-white, practically odourless, ly increased if necessary to 80 mg four times daily. It should be Uses and Administration crystalline powder. Soluble in water at pH 2; slightly soluble in withdrawn if there is no response in 2 weeks. Moxonidine is a centrally acting antihypertensive water at pH 7 to 10; freely soluble in alcohol and in methyl alco- Moxisylyte has been used locally in the eye to reverse the my- structurally related to clonidine (p.1247). It appears to hol; insoluble in acetone, in ether, in petroleum spirit, in trichlo- driasis caused by phenylephrine and other sympathomimetics. It act through stimulation of central imidazoline recep- roethane, and in benzene; slightly soluble in chloroform, in dichloromethane, and in isopropyl alcohol. has also been used orally in benign prostatic hyperplasia, al- tors to reduce sympathetic tone, and also has alpha - though such use has been associated with hepatotoxicity; the 2 doses used in prostatic hyperplasia were generally higher than adrenoceptor agonist activity. It is used in the treatment Adverse Effects, Treatment, and Precau- those in peripheral vascular disease. of hypertension (p.1171) and has also been investigat- tions ◊ Reviews. ed for heart failure (but see below). As for Beta Blockers, p.1226. 1. Marquer C, Bressolle F. Moxisylyte: a review of its pharmaco- In the treatment of hypertension, moxonidine is given dynamic and pharmacokinetic properties, and its therapeutic use Breast feeding. Nadolol is distributed into breast milk and in impotence. Fundam Clin Pharmacol 1998; 12: 377–87. orally in a usual initial dose of 200 micrograms once concentrations in milk are higher than those in maternal plasma. 1 Preparations daily. The dose may be increased if necessary, after 3 In a study in 12 normotensive women given nadolol 80 mg weeks, to 400 micrograms daily as a single dose or in daily by mouth for 5 days, the mean nadolol concentration in BP 2008: Moxisylyte Tablets. 2 divided doses, and after a further 3 weeks, to a max- milk for the 24 hours after the last dose was 357 nanograms/mL; Proprietary Preparations (details are given in Part 3) the equivalent mean serum-nadolol concentration was only Fr.: Carlytene; Icavex†; Irl.: Opilon; Port.: Arlitene†; UK: Opilon. imum dose of 600 micrograms daily in 2 divided dos- 77 nanograms/mL. It was calculated that a 5-kg infant would es. The dose should be reduced in patients with renal therefore ingest about 2 to 7% of an equivalent adult dose. No impairment (see below). adverse effects have been seen in breast-fed infants whose moth- ers were given nadolol and the American Academy of Pediatrics Moxonidine (BAN, USAN, rINN) ◊ References. considers2 that it is therefore usually compatible with breast feed- 1. Chrisp P, Faulds D. Moxonidine: a review of its pharmacology, ing. BDF-5895; BDF-5896; BE-5895; LY-326869; Moksonidi; Mokso- and therapeutic use in essential hypertension. Drugs 1992; 44: nidiini; Moksonidin; Moksonidinas; Moxonid; Moxonidin; Moxo- 993–1012. 1. Devlin RG, et al. Nadolol in human serum and breast milk. Br J nidina; Moxonidinum; Moxonidum. 4-Chloro-5-(2-imidazolin-2- 2. Schachter M, et al. Safety and tolerability of moxonidine in the Clin Pharmacol 1981; 12: 393–6. 2. American Academy of Pediatrics. The transfer of drugs and oth- ylamino)-6-methoxy-2-methylpyrimidine. treatment of hypertension. Drug Safety 1998; 19: 191–203. 3. Bousquet P, Feldman J. Drugs acting on imidazoline receptors: a er chemicals into human milk. Pediatrics 2001; 108: 776–89. Моксонидин review of their pharmacology, their use in blood pressure control Correction. ibid.; 1029. Also available at: C H ClN O = 241.7. and their potential interest in cardioprotection. Drugs 1999; 58: http://aappolicy.aappublications.org/cgi/content/full/ 9 12 5 pediatrics%3b108/3/776 (accessed 10/01/08) CAS — 75438-57-2. 799–812. 4. Schachter M. Moxonidine. Prescribers’ J 1999; 39: 113–17. ATC — C02AC05. Hypersensitivity. Hypersensitivity pneumonitis was associat- 5. Fenton C, et al. Moxonidine: a review of its use in essential hy- ed with nadolol in a patient given the drug for migraine.1 Symp- ATC Vet — QC02AC05. pertension. Drugs 2006; 66: 477–96. toms improved when nadolol was withdrawn. Administration in renal impairment. UK licensed product 1. Levy MB, et al. Nadolol and hypersensitivity pneumonitis. Ann information states that in patients with moderate renal impair- Intern Med 1986; 105: 806–7. OCH3 H ment (GFR 30 to 60 mL/minute) single doses of moxonidine N N should not exceed 200 micrograms and the daily dose should not Interactions N exceed 400 micrograms; moxonidine should not be given in se- The interactions associated with beta blockers are dis- vere impairment (GFR less than 30 mL/minute). HN cussed on p.1228. H3C N Cl Heart failure. Heart failure is usually treated with diuretics, ACE inhibitors, and beta blockers (see p.1165). Beta blockers are Pharmacokinetics thought to act by suppressing the sympathetic nervous system, Pharmacopoeias. In Eur. (see p.vii). Nadolol is incompletely absorbed from the gastrointes- Ph. Eur. 6.2 (Moxonidine). A white or almost white powder. which is activated in heart failure. Centrally-acting antihyperten- sives such as moxonidine also suppress sympathetic activation tinal tract to give peak plasma concentrations about 3 Very slightly soluble in water and in acetonitrile; slightly soluble 1 in dichloromethane; sparingly soluble in methyl alcohol. and might therefore have a role in heart failure. A study in pa- or 4 hours after a dose. It has low lipid solubility. Nad- tients with heart failure found that moxonidine reduced plasma- olol is widely distributed and concentrations found in noradrenaline concentrations and increased left ventricular ejec- breast milk have been higher than those in serum. It is Adverse Effects and Treatment tion fraction, but also led to an increase in adverse effects. A fur- Moxonidine has similar adverse effects to clonidine ther study2 was stopped early due to increased mortality in the only about 30% bound to plasma proteins. It does not (p.1247) but causes less sedation. The incidence of dry group receiving moxonidine. appear to be metabolised and is excreted mainly in the mouth may also be lower. 1. Swedberg K, et al. Effects of sustained-release moxonidine, an urine. The plasma half-life has been reported as rang- imidazoline agonist, on plasma norepinephrine in patients with chronic heart failure. Circulation 2002; 105: 1797–1803. ing from about 12 to 24 hours. Nadolol is reported to Precautions 2. Cohn JN, et al. Adverse mortality effect of central sympathetic be dialysable. Moxonidine should not be used in patients with con- inhibition with sustained-release moxonidine in patients with heart failure (MOXCON). Eur J Heart Fail 2003; 5: 659–67. ◊ In 4 patients with mild hypertension given nadolol 2 mg orally duction disorders, bradycardia, severe arrhythmias, or intravenously, the elimination half-life from plasma was an severe heart failure, severe ischaemic heart disease, se- Preparations average of 10 to 12 hours (a range of 5.9 to 12.2 hours after in- vere hepatic or renal impairment, or a history of an- Proprietary Preparations (details are given in Part 3) travenous doses, and a range of 9.6 to 14.2 hours after oral dos- gioedema. Licensed product information suggests that Austral.: Physiotens; Austria: Monox; Moxin; Normoxin; Belg.: Gilutens†; es). Calculations based on urinary excretion and plasma concen- Moxon; Braz.: Cynt; Cz.: Cynt; Moxogamma; Moxostad; Physiotens; tration data suggested that about 33% was absorbed after oral it should also be avoided in patients with intermittent Denm.: Moxonat; Physiotens; Fin.: Physiotens; Fr.: Physiotens; Ger.: Cynt; dosage. There was evidence of biliary as well as urinary excre- Moxobeta; Moxocard; moxodura; Moxogamma; Physiotens; Gr.: Cynt; Fi- claudication or Raynaud’s disease, Parkinson’s dis- siotens; Hong Kong: Physiotens; Hung.: Cynt; Moxogamma; Moxostad; tion since after intravenous dosage about 73% was excreted in ease, epilepsy, glaucoma, and depression. Moxonidine Physiotens; Indon.: Physiotens; Ital.: Fisiotens; Malaysia: Physiotens; urine and 23% in faeces. Nadolol did not appear to be metabo- is distributed into breast milk and should not be used Neth.: Moxamar; Moxaviv; Moxoham; Moxonur; Moxotel; Moxovasc; lised.1 In a similar study of therapeutic oral doses, terminal half- Normatens; Ratiomox; Norw.: Physiotens; Philipp.: Physiotens; Pol.: lives ranging from 14 to 17 hours were reported for nadolol during breast feeding. Moxogamma; Physiotens; Port.: Moxon; Rus.: Cynt (Цинт)†; Physiotens 80 mg given as a single dose and the same dose daily in a multi- (Физиотенз); S.Afr.: Physiotens; Singapore: Physiotens†; Spain: Moxon; 2 Although rebound hypertension has not been reported Swed.: Physiotens; Switz.: Physiotens; Turk.: Cynt; UK: Physiotens. ple dosage regimen. after moxonidine withdrawal it should not be stopped 1. Dreyfuss J, et al. Metabolic studies in patients with nadolol: oral and intravenous administration. J Clin Pharmacol 1977; 17: abruptly but should be withdrawn gradually over 2 300–7. weeks. As for clonidine (p.1247), if patients are also 2. Dreyfuss J, et al. Pharmacokinetics of nadolol, a beta-receptor receiving a beta blocker, this should be stopped several Nadolol (BAN, USAN, rINN) ⊗ antagonist: administration of therapeutic single- and multiple- dosage regimens to hypertensive patients.